macOS Open CL on rMPB doesn't work with GT 650M?

[oschrenk]

I'm trying to run Apple's Hello World OpenCL example. It does compile, but fails with

Error: Failed to create a command commands

.

I also tried to run a JOCL based sample application which also fails when trying to create a command queue with a GPU device (with CPU everything works fine.)

Does anybody else have this problems?

 

[Persifleur]

It works for me (rMBP running XCode 4.4.1 on 10.8.1).

Computed '1024/1024' correct values!

 

[oschrenk]

I've tried other peoples code,including the code samples from the OpenCL book and all fail with CL_INVALID_VALUE can't create Command queue.

I'm really stumped (and in despair to be honest, as I need this to work for my master thesis). I tried the examples in admin and standard accounts, and using gfxCardStatus forcing to use discrete graphics.


Have you installed anything besides XCode?

 

[Persifleur]

I've tried gcc and clang from the command line with the same result (clang -framework OpenCL hello.c -o hello). Using gfxCardStatus, I've tried both Automatic Switching and Discrete Only, neither of which failed. When set to Automatic Switching, I see the Growl notification that the 650M is briefly engaged before switching back to the 4000. I can only get it to fail if I set properties to a non-zero value in the call to clCreateCommandQueue.

Have you tried passing an error notification callback function into clCreateContext to see if you get anything useful?

e.g.

#include <OpenCL/cl_ext.h>

context = clCreateContext(0, 1, &device_id, [B]clLogMessagesToStdoutAPPLE[/B], NULL, &err);